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                                <h1 id="django&#x5165;&#x95E8;&#x4E0E;&#x5B9E;&#x8DF5;-&#x7B2C;21&#x7AE0;&#xFF1A;&#x8FC1;&#x79FB;">Django&#x5165;&#x95E8;&#x4E0E;&#x5B9E;&#x8DF5;-&#x7B2C;21&#x7AE0;&#xFF1A;&#x8FC1;&#x79FB;</h1>
<p>&#x8FC1;&#x79FB;&#xFF08;Migration&#xFF09;&#x662F;Django&#x505A;Web&#x5F00;&#x53D1;&#x7684;&#x57FA;&#x672C;&#x7EC4;&#x6210;&#x90E8;&#x5206;&#xFF0C;&#x5B83;&#x4F7F;&#x5F97;&#x6211;&#x4EEC;&#x5728;&#x6F14;&#x8FDB;&#x5E94;&#x7528;&#x7684;models&#x65F6;&#xFF0C;&#x5B83;&#x80FD;&#x4F7F;&#x5F97;models&#x6587;&#x4EF6;&#x4E0E;&#x6570;&#x636E;&#x5E93;&#x4FDD;&#x6301;&#x540C;&#x6B65;</p>
<p>&#x5F53;&#x6211;&#x4EEC;&#x7B2C;&#x4E00;&#x6B21;&#x8FD0;&#x884C;&#x547D;&#x4EE4; <code>python manage.py migrate</code>&#x7684;&#x65F6;&#x5019;&#xFF0C;Django &#x4F1A;&#x6293;&#x53D6;&#x6240;&#x6709;&#x8FC1;&#x79FB;&#x6587;&#x4EF6;&#x7136;&#x540E;&#x751F;&#x6210;&#x6570;&#x636E;&#x5E93; schema&#x3002;</p>
<p>&#x5F53;Django&#x5E94;&#x7528;&#x4E86;&#x8FC1;&#x79FB;&#x4E4B;&#x540E;&#xFF0C;&#x6709;&#x4E00;&#x4E2A;&#x7279;&#x6B8A;&#x7684;&#x8868;&#x53EB;&#x505A;<strong>django_migrations</strong>&#xFF0C;&#x5728;&#x8FD9;&#x4E2A;&#x8868;&#x4E2D;&#xFF0C;Django&#x6CE8;&#x518C;&#x4E86;&#x6240;&#x6709;&#x5DF2;&#x7ECF;&#x7684;&#x8FC1;&#x79FB;&#x8BB0;&#x5F55;&#x3002;</p>
<p>&#x6240;&#x4EE5;&#xFF0C;&#x5982;&#x679C;&#x6211;&#x4EEC;&#x91CD;&#x65B0;&#x8FD0;&#x884C;&#x547D;&#x4EE4;&#xFF1A;</p>
<pre><code class="lang-shell">python manage.py migrate
</code></pre>
<pre><code class="lang-shell">Operations to perform:
  Apply all migrations: admin, auth, boards, contenttypes, sessions
Running migrations:
  No migrations to apply.
</code></pre>
<p>Django &#x77E5;&#x9053;&#x6CA1;&#x4EC0;&#x4E48;&#x4E8B;&#x53EF;&#x505A;&#x4E86;&#x3002;</p>
<p>&#x73B0;&#x5728;&#x6211;&#x4EEC;&#x6DFB;&#x52A0;&#x5728; Topic &#x6A21;&#x578B;&#x4E2D;&#x6DFB;&#x52A0;&#x4E00;&#x4E2A;&#x65B0;&#x7684;&#x5B57;&#x6BB5;&#xFF1A;</p>
<p><strong>boards/models.py</strong>(<a href="https://gist.github.com/vitorfs/816f47aa4df8e7b157df75e0ff209aac#file-models-py-L25" target="_blank">&#x5B8C;&#x6574;&#x4EE3;&#x7801;</a>)</p>
<pre><code class="lang-python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Topic</span><span class="hljs-params">(models.Model)</span>:</span>
    subject = models.CharField(max_length=<span class="hljs-number">255</span>)
    last_updated = models.DateTimeField(auto_now_add=<span class="hljs-keyword">True</span>)
    board = models.ForeignKey(Board, related_name=<span class="hljs-string">&apos;topics&apos;</span>)
    starter = models.ForeignKey(User, related_name=<span class="hljs-string">&apos;topics&apos;</span>)
    views = models.PositiveIntegerField(default=<span class="hljs-number">0</span>)  <span class="hljs-comment"># &lt;- here</span>

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__str__</span><span class="hljs-params">(self)</span>:</span>
        <span class="hljs-keyword">return</span> self.subject
</code></pre>
<p>&#x6211;&#x4EEC;&#x6DFB;&#x52A0;&#x4E86;&#x4E00;&#x4E2A;<code>PositiveIntegerField</code>&#xFF0C;&#x56E0;&#x4E3A;&#x8FD9;&#x4E2A;&#x5B57;&#x6BB5;&#x5C06;&#x8981;&#x5B58;&#x50A8;&#x7684;&#x662F;&#x9875;&#x9762;&#x7684;&#x6D4F;&#x89C8;&#x91CF;&#xFF0C;&#x4E0D;&#x53EF;&#x80FD;&#x662F;&#x4E00;&#x4E2A;&#x8D1F;&#x6570;</p>
<p>&#x5728;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x8FD9;&#x4E2A;&#x65B0;&#x5B57;&#x6BB5;&#x524D;&#xFF0C;&#x6211;&#x4EEC;&#x5FC5;&#x987B;&#x66F4;&#x65B0;&#x6570;&#x636E;&#x5E93;schema&#xFF0C;&#x6267;&#x884C;&#x547D;&#x4EE4; <code>makemigrations</code></p>
<pre><code class="lang-shell">python manage.py makemigrations

Migrations for &apos;boards&apos;:
  boards/migrations/0003_topic_views.py
    - Add field views to topic
</code></pre>
<p><code>makemigrations</code>&#x4F1A;&#x81EA;&#x52A8;&#x751F;&#x6210;<strong>0003_topic_views.py</strong>&#x6587;&#x4EF6;&#xFF0C;&#x5C06;&#x7528;&#x4E8E;&#x4FEE;&#x6539;&#x6570;&#x636E;&#x5E93;&#xFF08;&#x6DFB;&#x52A0;&#x4E00;&#x4E2A;views&#x5B57;&#x6BB5;&#xFF09;</p>
<p>&#x73B0;&#x5728;&#x8FD0;&#x884C;&#x547D;&#x4EE4; <code>migrate</code>&#x6765;&#x5E94;&#x7528;&#x8FC1;&#x79FB;</p>
<pre><code class="lang-shell">python manage.py migrate

Operations to perform:
  Apply all migrations: admin, auth, boards, contenttypes, sessions
Running migrations:
  Applying boards.0003_topic_views... OK
</code></pre>
<p>&#x73B0;&#x5728;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x7528;&#x5B83;&#x6765;&#x8FFD;&#x8E2A;&#x6307;&#x5B9A;&#x4E3B;&#x9898;&#x88AB;&#x9605;&#x8BFB;&#x4E86;&#x591A;&#x5C11;&#x6B21;</p>
<p><strong>boards/views.py</strong> (<a href="https://gist.github.com/vitorfs/c0c97c1e050204d9152c59b4da2f9305#file-views-py-L41" target="_blank">&#x5B8C;&#x6574;&#x4EE3;&#x7801;</a>)</p>
<pre><code class="lang-python"><span class="hljs-keyword">from</span> django.shortcuts <span class="hljs-keyword">import</span> get_object_or_404, render
<span class="hljs-keyword">from</span> .models <span class="hljs-keyword">import</span> Topic

<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">topic_posts</span><span class="hljs-params">(request, pk, topic_pk)</span>:</span>
    topic = get_object_or_404(Topic, board__pk=pk, pk=topic_pk)
    topic.views += <span class="hljs-number">1</span>
    topic.save()
    <span class="hljs-keyword">return</span> render(request, <span class="hljs-string">&apos;topic_posts.html&apos;</span>, {<span class="hljs-string">&apos;topic&apos;</span>: topic})
</code></pre>
<p><strong>templates/topics.html</strong>(<a href="https://gist.github.com/vitorfs/70ebb1a06e1044387943ee83bafcd526" target="_blank">&#x5B8C;&#x6574;&#x4EE3;&#x7801;</a>)</p>
<pre><code class="lang-html">
{% for topic in topics %}
  <span class="hljs-tag">&lt;<span class="hljs-name">tr</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">td</span>&gt;</span><span class="hljs-tag">&lt;<span class="hljs-name">a</span> <span class="hljs-attr">href</span>=<span class="hljs-string">&quot;{% url &apos;topic_posts&apos; board.pk topic.pk %}&quot;</span>&gt;</span>{{ topic.subject }}<span class="hljs-tag">&lt;/<span class="hljs-name">a</span>&gt;</span><span class="hljs-tag">&lt;/<span class="hljs-name">td</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">td</span>&gt;</span>{{ topic.starter.username }}<span class="hljs-tag">&lt;/<span class="hljs-name">td</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">td</span>&gt;</span>{{ topic.replies }}<span class="hljs-tag">&lt;/<span class="hljs-name">td</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">td</span>&gt;</span>{{ topic.views }}<span class="hljs-tag">&lt;/<span class="hljs-name">td</span>&gt;</span>  <span class="hljs-comment">&lt;!-- here --&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">td</span>&gt;</span>{{ topic.last_updated }}<span class="hljs-tag">&lt;/<span class="hljs-name">td</span>&gt;</span>
  <span class="hljs-tag">&lt;/<span class="hljs-name">tr</span>&gt;</span>
{% endfor %}
</code></pre>
<p>&#x73B0;&#x5728;&#x6253;&#x5F00;&#x4E00;&#x4E2A;&#x4E3B;&#x9898;&#xFF0C;&#x5237;&#x65B0;&#x9875;&#x9762;&#x51E0;&#x6B21;&#xFF0C;&#x7136;&#x540E;&#x4F60;&#x4F1A;&#x770B;&#x5230;&#x6709;&#x9875;&#x9762;&#x9605;&#x8BFB;&#x6B21;&#x6570;&#x7EDF;&#x8BA1;&#x4E86;&#x3002;</p>
<p><img src="statics/5-17.png" alt="5-17.png"></p>
<h3 id="&#x603B;&#x7ED3;">&#x603B;&#x7ED3;</h3>
<p>&#x5728;&#x8FD9;&#x8282;&#x8BFE;&#x4E2D;&#xFF0C;&#x6211;&#x4EEC;&#x5728;&#x7559;&#x8A00;&#x677F;&#x7684;&#x57FA;&#x7840;&#x529F;&#x80FD;&#x4E0A;&#x53D6;&#x5F97;&#x4E86;&#x4E00;&#x4E9B;&#x8FDB;&#x6B65;&#xFF0C;&#x8FD8;&#x5269;&#x4E0B;&#x4E00;&#x4E9B;&#x4E1C;&#x897F;&#x7B49;&#x5F85;&#x53BB;&#x5B9E;&#x73B0;&#xFF0C;&#x6BD4;&#x5982;&#xFF1A;&#x7F16;&#x8F91;&#x5E16;&#x5B50;&#x3001;&#x6211;&#x7684;&#x8D26;&#x6237;&#xFF08;&#x66F4;&#x6539;&#x4E2A;&#x4EBA;&#x4FE1;&#x606F;&#xFF09;&#x7B49;&#x7B49;&#x3002;&#x4E4B;&#x540E;&#x6211;&#x4EEC;&#x5C06;&#x63D0;&#x4F9B;markdown&#x8BED;&#x6CD5;&#x548C;&#x5217;&#x8868;&#x7684;&#x5206;&#x9875;&#x529F;&#x80FD;&#x3002;</p>
<p>&#x4E0B;&#x4E00;&#x8282;&#x4E3B;&#x8981;&#x4F7F;&#x7528;&#x57FA;&#x4E8E;&#x7C7B;&#x7684;&#x89C6;&#x56FE;&#x6765;&#x89E3;&#x51B3;&#x8FD9;&#x4E9B;&#x95EE;&#x9898;&#xFF0C;&#x5728;&#x4E4B;&#x540E;&#xFF0C;&#x6211;&#x4EEC;&#x5C06;&#x5B66;&#x4E60;&#x5230;&#x5982;&#x4F55;&#x90E8;&#x7F72;&#x5E94;&#x7528;&#x7A0B;&#x5E8F;&#x5230;Web&#x670D;&#x52A1;&#x5668;&#x4E2D;&#x53BB;&#x3002;</p>
<p>&#x8FD9;&#x90E8;&#x5206;&#x7684;&#x5B8C;&#x6574;&#x4EE3;&#x7801;&#x53EF;&#x4EE5;&#x8BBF;&#x95EE;&#xFF1A;<a href="https://github.com/sibtc/django-beginners-guide/tree/v0.5-lw" target="_blank">https://github.com/sibtc/django-beginners-guide/tree/v0.5-lw</a></p>

                                
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